The difference in just 100 numbers on a seniority list can make or break a career at a new airline. I know personally of people who saw time to command stretch out 5 more years over such a small number. Now, when AC is hiring 40/mo, and US airlines doing that weekly (with BA and QF not far behind), you will possibly see years more as an FO with that many joining ahead of you. If you know (KNOW) you are going to leave CX, then don't hesitate. Otherwise, you could be stuck here (and your family) living in a shoe-box (rented) for the rest of your days. And just think how pleasant that will be with CX's proven management skills at dealing with their staff
. Seriously, the best time to leave is always 'now'. There is no future of any value at CX, and the doors are open at almost every respectable airline in the first world. Don't miss your chance.